![]() ![]() Based on this result, we further derived the requirements for developing an OSC project management system. In this study, targeting precast concrete (PC) construction, which is one of the representative construction types of the OSC method, we derive the characteristics of OSC project management in six aspects: production place and time, production process, production method of construction, production method, production entity and facilities, and production environment. Although efficient performance of an OSC project requires development of management techniques, and application of a management system that reflects the characteristics of the OSC projects, related technologies remain in their infancy. There has been increasing interest in the off-site construction (OSC) method in response to issues such as stagnant labor productivity, shortage of skilled workers, challenging site management, heightened safety and health-related regulations, and the push for carbon neutrality. A case study of a modularized house reveals that a considerable amount of time saving and accuracy increasing of project estimation are achieved as a result of achieving the quantity takeoff automation. A prototype system is developed based on Autodesk Revit through Revit Application Programming Interface. ![]() As a result, the explicitly extracted quantities are converted by the preloaded formulas to the required format for the purpose of ordering and purchasing. Besides this, the unique classification information, along with formulas for derivedquantities, is front-loaded into the Excel Sheet database. The main concept is to pre-load the unique classification information into the BIM model such that the quantity of materials in a given BIM model can be extracted and stored into a database (Excel Sheet) automatically in according with the preloaded classification system. This study thus exploits a methodology which allows construction practitioners to obtain quantity takeoff in an automatic manner. This is partially due to the fact that incorporating cost breakdown structure formulated according to industry companies’ classification system into BIM still remains a challenge. However, this process in current practice involves massive manual interventions, which is extremely time consuming and highly error-prone. ![]() Quantity takeoff, serving as a foundation for the downstream tasks in the construction management, is a repetitive work.
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